Note 2 - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Allowance for doubtful accounts	$ 250,000	$ 250,000
Allowance for doubtful accounts	8,000	18,000
Allowance for doubtful accounts	(8,000)	(18,000)
Allowance for doubtful accounts	$ 250,000	$ 250,000